Letter to Richard Vynne Southwell, regarding four papers 'Relaxation methods applied to engineering problems VIIA - Biharmonic analysis as applied to the flexure and extension of flat elastic plates' by L Fox and Richard Vynne Southwell, 'Relaxation methods applied to engineering problems VIIB - The elastic stability of plane frameworks and of flat plating' by Derman Guy Christopherson, L Fox, J R Green, F S Shaw and Richard Vynne Southwell, 'Relaxation methods applied to engineering problems VIIC - Free transverse vibrations of membranes, with an application (by analogy) to two-dimensional oscillations in an electro-magnetic system' by D N De G Allen, L Fox, H Motz and Richard Vynne Southwell and 'Relaxation methods applied to engineering problems VIID - Stress distributions in elastic solids of revolution' by D N De G Allen, L Fox and Richard Vynne Southwell Sectional Committee: Engineering The copy method means there is no need to scrutinise each page of the proofs. There is no cost to the author for requesting copies, as he has not yet received author's copies. Apologises for the incomplete proofs, can take this up with Cambridge University Press. [Published in the Philosophical Transactions of the Royal Society] Endorsed on recto as received 8 August 1945. 27 July 1945